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1988 Chevy Truck 305 Engine Idling and ****** shifting problem

What would cause the RPM to increase for no apparent reason and eventually drop back to normal idle. This vehicle requires pumping the gas pedal in order to get it started,plus when driving it rev's very high before going into the next gear. Would the ECM cause this type of erratic behavior.Tb as been change with a used one including TPS,IAC Valve,fuel injectors which leaking and reason for replacement of TB.Timing as be set to specs. Any help would be appreciated

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  • 81 Answers

Check the vacuum lines going to the tranny, but it sounds like a vacuum leak, when the engine is at idle, spray a few short blasts of starting fluid around all the vacuum lines, if the rpms jump up, thats where the leak is

Posted on Jun 11, 2017

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Posted on Jan 02, 2017

djicenova
  • 319 Answers

SOURCE: High Idle

what size engine does it have? there is usually a throttle advance/decrease screw on the throttle body. back it off a few turns, and see what that does. the fan control is a thermostatic bulb sensor that screws into the intake manifold.

Have you checked the MAF?

Posted on Mar 02, 2009

  • 295 Answers

SOURCE: 1997 DODGE RAM 1500 360 VERY LOW IDLE

I think you have ruled out the engine with all the parts you have replace. The transmission torque convertor is in lock up mode all the time. The engine is having to hard of a time to stay at the normal idle. The over drive clutches and soleniod are most likely damaged in the transmission.
I think you should take the vehicle to a trasnmission shop , The can check the torque convetror soleniods and pressure control soleniod.

The oil light coming on bothers me. I know you have the rebuilt engine in the vehicle but I think the oil pump in the engine is starting to go out or could be weak. The lower bearings connected to the crank shaft might be starting to leak. Have the oil pressure checked .

Posted on Mar 19, 2009

  • 71 Answers

SOURCE: 92 chevy truck 5.7 idle revs up and down high emissions

sounds like a vacuum leak check hoses and manifold

Posted on Mar 28, 2009

  • 14 Answers

SOURCE: 1992 gmc chevy 350 wont idle when warm

This could be a number of things but i think that your problem sounds like a vacuum leak or an EGR problem. Try listening for leaks and try un-plugging the EGR solenoid valve one time.

Posted on Apr 17, 2009

wyatt1582
  • 453 Answers

SOURCE: 1988 Ford Ranger Super 2.9L V6 Hesitating and Stalling out

Check EGR valve this controls idle speed it might have carbon build up hold the valve open. All so check fuel pressure.

Posted on Jun 26, 2009

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